http://www.legislation.gov.uk/uksi/2021/1391/regulation/17The Building Regulations etc. (Amendment) (England) Regulations 2021enBUILDING AND BUILDINGS, ENGLANDStatute Law Database2026-03-23Expert Participation2024-04-06 These Regulations amend the Building Regulations 2010 (S.I. 2010/2214) and the Building (Approved Inspectors etc.) Regulations 2010 (S.I. 2010/2215) as they apply in relation to England. The amendments made by these Regulations provide for a new metric for the measurement of energy efficiency in the form of the target primary energy rate and introduce new regulation for on-site electricity generation and in relation to overheating (in particular by virtue of the introduction of paragraph L2 into part L of Schedule 1 to S.I. 2010/2214, and a new Part O). Amendments are made to S.I. 2010/2215 in consequence of these changes. The Building Regulations etc. (Amendment) (England) Regulations 2021reg. 17(1)(a)The Building Regulations etc. (Amendment) (England) Regulations 2026reg. 10(2)reg. 10(3)(4)reg. 1(2)(3) PART 4171The amendments made by Parts 2 and 3 of these Regulations (other than regulations 9, 12 and 13) do not apply in relation to—abuilding work to which regulation 9 (transitional provisions) of the Building Regulations &c. (Amendment) (No. 2) Regulations 2013 applies; andbbuilding work on a particular building, where a building notice or an initial notice has been given to, or full plans have been deposited with, a local authority, in respect of that building before 15th June 2022, provided that the building work on that building is started before 15th June 2023.2In this regulation, “building notice”, “initial notice” and “full plans” have the meanings given in regulation 2(1) of the Building Regulations.Reg. 17 in force at 15.6.2022, see reg. 1(1)Reg. 17(1) substituted (5.6.2023) by The Building etc. (Amendment) (England) Regulations 2023 (S.I. 2023/520), regs. 1(2), 3